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    <item>
      <title>Erhöhte neuroendokrine Reaktion auf eine wiederholte Ausdauerbelastung</title>
      <pubDate>Mon, 01 Jan 2001 09:22:18 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/3032877</link>
      <guid>https://sponet.de/sponet/Record/3032877</guid>
      <author>Ronsen, O.</author>
      <author>Haug, E.</author>
      <author>Klarlund Pedersen, B.</author>
      <author>Bahr, R.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Belastung</dc:subject>
      <dc:subject>Belastungsgestaltung</dc:subject>
      <dc:subject>Wiederherstellung</dc:subject>
      <dc:subject>Hormon</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Ronsen, O.</dc:creator>
      <dc:creator>Haug, E.</dc:creator>
      <dc:creator>Klarlund Pedersen, B.</dc:creator>
      <dc:creator>Bahr, R.</dc:creator>
      <content:encoded><![CDATA[Zielstellung:
Vergleich der endokrinen Reaktionen bei einer hochintensiven Ausdauerbelastung und bei zwei Ausdauerbelastungen gleicher Intensität am gleichen Tag.
Probanden/Methoden:
9 männliche Ausdauersportler (4 Triathleten und 5 Eisschnellläufer der Nationalmannschaften) absolvierten 3 Tests mit einer Dauer von 24 Stunden: 1. Komplette Bettruhe, 2. eine Ausdauerbelastung (ONE), 3. zwei Ausdauerbelastungen mit einer Pause von 3 Stunden (TWO). Jede Belastung bestand aus 10-minütiger Erwärmung bei 50% der VO2max und einer Fahrradergometerbelastung von65 min bei 75% der VO2max. Die Belastung fand zwischen 11.00 und 12.15 (nur bei TWO) und 15:15 und 16.30 (ONE und TWO) statt. Die Probanden blieben außer bei den Belastungstest im Bett.
Ergebnisse:
1. Erhöhungen bei Adrenalin, Noradrenalin, ACTH, Kortisol, Wachstumshormon und Verminderungen bei Testosteron während und/oder nach der 2. Belastung im Vergleich mit der 1. Belastung.
2. Keine Unterschiede bei Insulin, follikelstimulierendem Hormon, luteinisierendem Hormon, Thyroid stimulierendem Hormon, freier Fraktion  von Thyroxin und insulinähnlichem Wachstumsfaktor 1.]]></content:encoded>
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    <item>
      <title>Erhöhte neuroendokrine Reaktion auf eine wiederholte Ausdauerbelastung</title>
      <pubDate>Mon, 01 Jan 2001 09:22:18 +0100</pubDate>
      <link>https://sponet.de/sponet/Record/4005502</link>
      <guid>https://sponet.de/sponet/Record/4005502</guid>
      <author>Ronsen, O.</author>
      <author>Haug, E.</author>
      <author>Pedersen, B. K.</author>
      <author>Bahr, R.</author>
      <dc:format>Artikel</dc:format>
      <dc:subject>Ausdauer</dc:subject>
      <dc:subject>Belastung</dc:subject>
      <dc:subject>Hormon</dc:subject>
      <dc:subject>Langstreckenlauf</dc:subject>
      <dc:subject>Stoffwechsel</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:creator>Ronsen, O.</dc:creator>
      <dc:creator>Haug, E.</dc:creator>
      <dc:creator>Pedersen, B. K.</dc:creator>
      <dc:creator>Bahr, R.</dc:creator>
      <content:encoded><![CDATA[This study was designed to compare a first bout of high-intensity endurance exercise with a second bout of similar exercise on the same day, and thereby test the hypothesis that the endocrine response elicited by a second bout is more pronounced compared with a single bout of exercise. Nine male, elite endurance athletes participated in three trials of 24-h duration: 1) complete bed rest (REST), 2) one bout of exercise (ONE), and 3) two bouts of exercise separated by a 3-h rest period (TWO). Each exercise bout consisted of a 10-min warm-up at 50% of VO2max followed by 65 min at 75% of VO2max on a cycle ergometer. Exercise was performed between 11:00 a.m. and 12:15 a.m. (only in TWO) and 3:15 and 4:30 p.m. (both ONE and TWO). The subjects rested in bed at all hours except when exercising. Blood was sampled 11 times at identical time-points until 7:30 a.m. the next morning. We observed significantly increased levels of epinephrine, norepinephrine, ACTH, cortisol, and growth hormone, and decreased levels of testosterone during and/or after the second bout of exercise compared with the first bout. No difference was observed for insulin, follicle stimulating hormone, luteinizing hormone, thyroid stimulating hormone, free fraction of thyroxin or insulin-like growth factor 1. Thus, this study demonstrates a more pronounced neuroendocrine response to a second bout of exercise on the same day compared with a first/single bout, involving both the sympatho-adrenal system and the hypothalamo-pituitary-adrenal axes. ]]></content:encoded>
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